9=3(f-7)

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Solution for 9=3(f-7) equation: 



9=3(f-7)

We move all terms to the left:

9-(3(f-7))=0



We calculate terms in parentheses: -(3(f-7)), so:

3(f-7)

We multiply parentheses

3f-21

Back to the equation:

-(3f-21)



We get rid of parentheses

-3f+21+9=0

We add all the numbers together, and all the variables

-3f+30=0

We move all terms containing f to the left, all other terms to the right

-3f=-30

f=-30/-3

f=+10

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